An Australian man has been charged with a terrorism offence.
The 21-year-old was arrested on the New South Wales south coast after authorities had been tracking him for several weeks.
NSW Police Assistant Commissioner Mark Walton said officers swooped on the man's location in Sanctuary Point after realising his alleged online behaviour was of 'significant' concern.
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"This person had anti-government sentiment, he was anti-semitic, he has neo-Nazi interests and he has anti-indigenous interests," Mr Walton said in a press conference.
Authorities say they became concerned about the man after he was allegedly responsible for posting about 'extreme right-wing and anti-government ideology' online.
As a result, he's been charged with one count of acts done in preparation for, or planning, terrorist acts.
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Australian Federal Police Assistant Commissioner Scott Lee told reporters that the 21-year-old was allegedly planning to disrupt an electrical substation on the South Coast and was also trying to source material to construct an improvised explosive device.
"It will be alleged the man was attempting and planning to purchase or acquire military equipment, including firearms and items capable of making improvised explosive devices," Assistant Commissioner Lee said.
"The investigation into this matter remains ongoing, but the speed with which it has progressed highlights the professionalism and dedication of the individuals and agencies involved in the JCTT, and their commitment to bringing people to account for their criminal actions."
He added that arresting the man now was the best course of action, so that he couldn't continue to plan something that 'could have resulted in a terrorist attack'.
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During the arrest, police will allege that they found several electronic devices, tactical equipment and three paintball firearms at a property at Sanctuary Point. At a separate property in Parma, southwest of Nowra, four registered firearms were also located.
NSW Police Assistant Commissioner Mark Walton has appealed to people to be on the lookout for sketchy online behaviour: "I would appeal to all members of the community to help us do this - if you see something online, report it.
"Be aware of the online activities of your children. There is no place for violent extremism in our community and we need to continue to unite in condemning this behaviour."
The 21-year-old is expected to face court today.
Featured Image Credit: ABC